Authentication device



FIG. 1 is a front, left side, top perspective view of an authentication device showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a rear, right side, top perspective view thereof; and,

FIG. 9 is a cross-sectional view thereof, taken in the direction of line 9-9 of FIG. 3. 

CLAIM The ornamental design for an authentication device, as shown and described. 